Toyota
Ford Kuga
 Service Manual
Supplemental Restraint System » Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) (System Operation and Component Description)
Component Description

Central junction box

Central junction box

Electronic sensors are incorporated into the RCM; these measure the vehicle acceleration/deceleration in the event of a collision.

The calculated value is evaluated by the RCM to determine the severity of the impact.

The RCM compares the values it receives from the crash sensor, side impact sensors and the internal electronic sensors. If the deceleration due to a frontal or side impact exceeds a stored threshold value then the RCM triggers the airbags and safety belt pretensioners as required.

Deployment control: Depending on the severity of the collision, the RCM decides which of the elements of the restraint system should be deployed. An energy reserve in the RCM ensures there is always a minimum of 150 milliseconds of stored energy available if the power supply from the ignition switch is disrupted during a crash. The stored energy is sufficient to produce firing signals for the driver air bag, the passenger air bag and the safety belt pretensioners. When the ignition is switched on the RCM performs cyclical monitoring of the system. If a fault is detected the RCM stores a related fault code and sends the signal to illuminate the air bag warning indicator. Faults can be read out via the diagnostic unit.

Front impact sensor

Front impact sensor

Data from the crash sensor are evaluated by the RCM to assess the severity of a frontal impact. The crash sensor transmits digitally encoded acceleration information to the RCM.

The RCM will store a trouble code (DTC) if one of the crash sensors fails.

Crash sensor, left/right

Crash sensor, left/right

The left/right crash sensors transmit digitally encoded acceleration information to the RCM.

Driver and passenger front air bag system

Driver and passenger front air bag system

The driver and passenger air bags are single-stage air bags.

Passenger Air Bag Deactivation

Passenger Air Bag Deactivation

When the ignition is switched on, a warning lamp in the instrument panel indicates to the driver and passenger that the passenger air bag module has been deactivated.

Side air curtain module

Side air curtain module

In the event of a side impact the relevant side air curtain is deployed and forms a protective cushion between the corresponding side window and the head of the person(s) sat on the front and rear seat.

The side air curtains are deployed simultaneously with the side air bags.

Side airbag

Side airbag

When a side air bag is deployed, the seam of the seat cover tears open enabling the side air bag to inflate unhindered from the front seat backrest.

Pre-tensioner seat belt

Pre-tensioner seat belt

In the event of a collision, the safety belt pretensioners are either triggered alone or together with the front airbags depending on the severity of the impact.

Seat occupancy sensor, passenger side

Seat occupancy sensor, passenger side

The seat occupancy sensor is located in the cushion of the passenger seat between the foam lining and the cover. The sensor consists of a foil contact circuit, embedded in a plastic sheet. Weight on the sensor reduces the resistance of the circuit.

The safety belt buckle switch provides an output signal in response to the insertion of the safety belt tongue into the buckle. The output signal from the switch is used by the RCM to determine whether the front seat occupants are correctly restrained.

    More about «Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) (System Operation and Component Description)»:

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